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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Supplemental Cash Flow [Line Items]      
Interest $ 22.3 $ 13.7 $ 10.3
Income taxes 79.8 65.5 12.6
Captial lease arrangments 43.0 33.9 13.4
Proceeds from Sale-leaseback Transations 17.6 1.2 13.6
Value of Shares of Common Stock for Defined Benefit Plan Contribution     $ 57.6